33results about How to "Strong engineering realization" patented technology

The invention discloses a tether dragging control method and system for an out-of-service satellite carrying a solar sail. Aiming at the sail board vibration problem that may occur during the out-of-orbit process of an out-of-service satellite carrying a solar sail, a sufficient method is proposed. The tether dragging control method considering the flexibility of the sailboard belongs to the field of spacecraft attitude dynamics and control. The invention can well reflect the influence of the vibration of the solar sail plate, and the control method effectively reduces the vibration amplitude of the solar sail plate in the dragging process. The actuator on the main satellite outputs the required constant tension and applies it to the failed satellite carrying the solar panel to suppress the vibration of the solar panel of the failed satellite during the towing process. The invention is used to control the vibration of the sail plate in the process of dragging and de-orbiting after the failed satellite carrying the solar sail plate is captured by flying net, and provides technical support for cleaning up large-scale failed satellites in space.

The invention relates to an accurate attitude adjustment installation platform for an engine switching casing. The installation platform comprises a driving chassis (1), a lifting mechanism (2) and areplaceable pre-installation platform (3), wherein lifting mechanism (2) is fixedly installed right above the driving chassis (1), the replaceable pre-installation platform (3) is fixed right above the lifting mechanism (2) through bolts, the driving chassis (1) includes an electrically-driven chassis (1-1), a Mecanum wheel (1-2) and a wired remote control operator (1-3), the lifting mechanism (2)includes support rods (2-1), a rotary lifting electrically-driven vertical column (2-2) and an upper platform (2-3), and the replaceable pre-installation platform (3) includes a switching casing support platform (3-1), a platform lifting bracket (3-2) and a casing lifting lug (3-3).

The utility model relates to a double bypass ejector device for aero-engine, and the inner channel body is located in the ejector. The airflow inlet ends of each flow-stabilizing branch plate are respectively fixed on the inner surface of the shell of the middle section of the ejector, and communicate with the annular high-pressure gas source chamber on the middle section of the ejector; the closed end of each flow-stabilizing branch plate is located in the inner channel in vivo. The outer duct of the ejection device is formed between the inner surface of the ejector and the outer surface of the inner duct body, and the inner duct body of the ejection device is formed by the inner hole of the inner duct body. The invention changes the exhaust speed of the internal and external injection through the distributed variable Mach number nozzle, realizes the variable bypass ratio injection, and can carry out the power simulation of the turbofan engine, and the intake and exhaust positions of the internal channel of the ejector are located In the outer duct, the high-speed mixed ejection gas of the inner duct body can further eject the outer duct mixed gas at the outlet of the duct support plate, which realizes the secondary ejection of the duct, further improves the kinetic energy of the outer duct mixed ejection flow, and also improves the overall ejection efficiency.

The invention discloses an ultraviolet continuous zoom telescopic optical system, which comprises a front fixed lens group, a variable power lens group, a compensation lens group and a rear fixed lens group arranged sequentially from the object space to the image space, and the aperture diaphragm is arranged on the compensation lens group and the rear fixed lens group, and close to the rear fixed lens group. The invention can realize continuous zooming, the range of the focal length is 120 mm to 480 mm, the zooming range is large, and the consistency of the system resolution and the stability of the imaging performance are realized under different focal lengths; a fixed F number and large zoom ratio are provided. Ultraviolet telephoto optical system, the F number of the system is 4.5, and the zoom ratio is 4; all lenses are spherical lenses.

A space multifunctional inflatable airtight cabin skin structure suitable for a manned environment, comprising: a wear-resistant layer, a radiation protection layer, an airtight layer, a pressure-bearing layer, a fragment protection layer, Heat insulation layer, anti-space environment layer and flame retardant layer. The present invention adopts a technical means composed of fully flexible materials for the structure of the airtight cabin, and through the optimized configuration and design of multi-layer materials with different functions, it plays the roles of airtightness, pressure bearing and protection for the cabin structure, and brings the airtight cabin Light weight, small folding volume and other effects can directly guide the design of the structure of the compressible and foldable inflatable expandable manned airtight cabin.

The invention discloses a frequency step signal speed compensation system based on a difference frequency dual waveform, comprising: a difference frequency dual-band signal generating unit (2), a broadband antenna feed system (3), and a difference frequency dual-band signal receiving unit (4 ), a frequency source (5) and a signal processor (6); the difference-frequency dual-band signal generation unit (2) transmits a difference-frequency dual-waveform signal, and the difference-frequency dual-band signal receiving unit (4) receives an echo signal, and the signal processor (6) Complete the speed compensation. The invention can solve the problem of poor engineering realizability of the existing step frequency signal speed measurement method, is realized through hardware design, is less constrained by conditions, has strong engineering realizability and high compensation precision.

A hybrid switching structure suitable for on-board processing transponders, including an ingress port processing unit, a shared buffer, a space division switching unit, a switching control unit, and a frame shaper; the ingress port processing unit adapts the time slot frame, Classification processing, output two channels after processing, one channel of continuous time slot frames is sent to the space division switching unit, one channel of packet data stream is sent to the shared buffer; the shared buffer is used for buffer space allocation and mapping management, and outputs corresponding packets according to scheduling instructions to the frame shaper of the specified port; the space division switching unit sends the time slots of the incoming port to the frame shaper in real time according to the control information; the frame shaper puts the time slots into the designated time slot buffer and shares The packets output by the buffer are encapsulated into idle service time slots according to the priority, and at the same time, the data serial output of the specified time slot buffer area is read according to the frame start sending instruction. The invention can support circuit switching services and packet switching services of various rates, and supports any proportion of the two types of services.

The invention relates to the field of aero-engine testing, in particular to a roller adapter that can be installed and locked vertically. The roller adapter includes: a slider seat, a front support roller, a rear support roller, and an adjustable holding part; The installation surface; the front support roller and the rear support roller are set on both sides of the holding part; among them, when the support part does not fully hold the beam, the roller adapter uses the part of the beam that can be held as a slide rail, using the front support roller and the rear support roller Roll on the slide rail to a suitable holding position to hold the beam.

The invention discloses a forced diversion control method which includes first conducting diversion nominal track design according to a designated diversion period, conducting subsection planning on a motor-driven path based on error boundary and adopting a single pulse control method based on C-W guidance rate in each section to achieve track tracking of the subsection planning route to form a single side limit cycle. The method completely utilizes diversion largest error boundary, plans movement track in an error boundary and controlled diversion track moving tread, achieves quick diversion, saves fuel consumption and has strong engineering practicalness.

The invention discloses a control method for the orbit and the attitude of a satellite, which is characterized by comprising the following steps of: determining disturbance moment for the control of the orbit; determining a control strategy for the attitude according to the disturbance moment, wherein the control strategy for the attitude comprises a control mode of air jet or a control mode of angular momentum exchange; determining an air jet strategy for the control of the orbit according to the control strategy for the attitude; and carrying out the control of the orbit and the attitude according to the air jet strategy. The method can be suitable for a satellite with large disturbance moment in the orbit-controlled air jet process.

The invention discloses a system for preparing a hydrogen-rich synthesis gas by employing iron ore catalytic reforming of bio-oil, belongs to a system for preparing a hydrogen-rich synthesis gas through catalytic reforming of the bio-oil, and aims at solving the problems of inactivation of a catalyst caused by an existing process for preparing the hydrogen-rich synthesis gas by employing iron-based catalyst reforming of the bio-oil and a low iron ore grade in China at present to achieve high values of the bio-oil and the iron ore. The system comprises a preheating device, a steam generator, a reforming reactor, a heating furnace, a purifying column and an air cooling chamber. The system is simple in formation, efficient, energy-saving, economic, and high in engineering realizability and wide in application range of raw materials; the added value of a product of a technology for iron ore catalytic reforming of the bio-oil is increased; and the method is suitable for high-value utilization of various biomass-based bio-oil products and grade improvement technologies of various low-grade iron ores.

The present application discloses a method and a converter for suppressing subsynchronous resonance of a doubly-fed wind turbine. The method includes: acquiring a stator current i of a doubly-fed wind turbine s_meas and rotor current i′ r_meas , calculate the subsynchronous current component i in the excitation current of the DFIG m_ss , and then through the amplitude and phase transformation to form the subsynchronous damping action u c_ss , to form the final action amount superimposed on the basic action amount of the doubly-fed wind turbine. The present application calculates the subsynchronous current component in real time based on the stator current and rotor current of the doubly-fed wind turbine. Compared with the detection of the subsynchronous component in the grid voltage, the engineering is simpler and more reliable, and there is no need to accurately identify the frequency point of the subsynchronous resonance. The damping control of subsynchronous resonance can be realized in a wide frequency band, thereby eliminating the risk of subsynchronous resonance when the doubly-fed wind turbine is connected to a specific power grid, and ensuring the safe and stable operation of the system after connecting to the power grid.